Hashimoto's thyroiditis is a chronic autoimmune disease and is the most common type of thyroiditis clinically. Its etiology is primarily immunological, as Hashimoto's thyroiditis is an autoimmune disorder. Therefore, patients can detect a high concentration of anti-thyroid antibodies through blood tests, such as anti-thyroglobulin antibodies and anti-microsomal antibodies. Additionally, genetic factors are involved, with about 50% of patients with Hashimoto's thyroiditis having a family history. Environmental factors, including radiation, infections, excessive dietary iodine, and selenium deficiency, can also lead to Hashimoto's thyroiditis. In recent years, the incidence of Hashimoto's thyroiditis has notably increased.